Aye Ian,
This re-finishing compound works very well on "orange peel" rattle can paintwork: Farecla G3 Pro Colour Restorer 500ml
Use the foam pads that are designed to apply the compound and I found worked very well on my Ducati 450 side panels, sprayed with Holts "Ford, Rosso Red": Farecla G3 Pro Applicator Waffle Pads
Both are available off the shelf in Halfrauds.
Good health, Bill